
(map file-exists? 
     '("/etc/passwd" "/etc/NOTAFILE"))	; => (#t #f)

(file-modification-time "/etc/passwd")	; => <integer>

(file-size "/etc/passwd")		; => <integer>

(map directory-exists? 
     '("/etc" "/etc/passwd"))		; => (#t #f)

(directory-contents "/etc")		; => <list> of <string>
